<?php 
class Smtp {
  /* Public Variables */ 
  var $smtp_port; 
  var $time_out; 
  var $host_name; 
  var $mail_from; 
  var $log_file; 
  var $relay_host; 
  var $debug; 
  var $auth;
  var $user; 
  var $pass;
  var $helo;

  /* Private Variables */  
  var $sock; 

  /* Constractor */ 
  function __construct($relay_host, $smtp_port, $user, $pass) {
    $this->helo = 'sending HELO command';
    $this->debug = FALSE; 
    $this->smtp_port = $smtp_port; 
    $this->relay_host = $relay_host; 
    //is used in fsockopen()
    $this->time_out = 30;
    // 权限验证 true/false
    $this->auth = true;
    $this->user = $user; 
    $this->pass = $pass; 
    //is used in HELO command
    $this->host_name = "localhost"; 
    $this->log_file = ""; 
    $this->sock = FALSE; 
  } 

  /* Main Function */
  function sendmail($to, $from, $subject, $body) {
    $this->mail_from = $this->get_address($this->strip_comment($from)); 
    $body = preg_replace("/(^|(\r\n))(\.)/", "\1.\3", $body); 
    $header = "MIME-Version:1.0\r\n";
    //邮件格式（HTML/TXT）,TXT为文本邮件屏蔽下行
    $header .= "Content-Type:text/html\r\n";
    $header .= "To: ".$to."\r\n";
    if (!empty($cc)) {
      $header .= "Cc: ".$cc."\r\n"; 
    } 
    $header .= "From: $from<".$from.">\r\n"; 
    $header .= "Subject: ".$subject."\r\n"; 
    $header .= !empty($additional_headers) ? $additional_headers : ''; 
    $header .= "Date: ".date("r")."\r\n"; 
    $header .= "X-Mailer:By Redhat (PHP/".phpversion().")\r\n"; 
    list($msec, $sec) = explode(" ", microtime()); 
    $header .= "Message-ID: <".date("YmdHis", $sec).".".($msec*1000000).".".$this->mail_from.">\r\n"; 
    $TO = explode(",", $this->strip_comment($to)); 

    if (!empty($cc)) {
      $TO = array_merge($TO, explode(",", $this->strip_comment($cc))); 
        } 
    if (!empty($bcc)) {
      $TO = array_merge($TO, explode(",", $this->strip_comment($bcc))); 
    } 
    $sent = TRUE; 
    foreach ($TO as $rcpt_to) {
      $rcpt_to = $this->get_address($rcpt_to); 
      if (!$this->smtp_sockopen($rcpt_to)) {
        $this->log_write("Error: Cannot send email to ".$rcpt_to."\n"); 
        $sent = FALSE; 
        continue; 
      } 
      if ($this->smtp_send($rcpt_to, $header, $body)) {
        $this->log_write("E-mail has been sent to <".$rcpt_to.">\n"); 
      } else {
        $this->log_write("Error: Cannot send email to <".$rcpt_to.">\n"); 
        $sent = FALSE; 
      } 
      fclose($this->sock); 
      $this->log_write("Disconnected from remote host\n"); 
    } 
    return $sent; 
  } 

  /* Private Functions */ 
  function smtp_send($to, $header, $body = "") {
    if (!$this->smtp_putcmd("HELO", $this->host_name)) {
      return $this->smtp_error($this->helo); 
    }
    if($this->auth) {
      if (!$this->smtp_putcmd("AUTH LOGIN", base64_encode($this->user))) {
        return $this->smtp_error($this->helo); 
      } 
      if (!$this->smtp_putcmd("", base64_encode($this->pass))) {
        return $this->smtp_error($this->helo); 
      } 
    } 
    if (!$this->smtp_putcmd("MAIL", "FROM:<".$this->mail_form.">")) {
      return $this->smtp_error("sending MAIL FROM command"); 
    } 
    if (!$this->smtp_putcmd("RCPT", "TO:<".$to.">")) {
      return $this->smtp_error("sending RCPT TO command"); 
    } 
    if (!$this->smtp_putcmd("DATA")) {
      return $this->smtp_error("sending DATA command"); 
    } 
    if (!$this->smtp_message($header, $body)) {
      return $this->smtp_error("sending message"); 
    } 
    if (!$this->smtp_eom()) {
      return $this->smtp_error("sending <CR><LF>.<CR><LF> [EOM]"); 
    } 
    if (!$this->smtp_putcmd("QUIT")) {
      return $this->smtp_error("sending QUIT command"); 
    } 
    return TRUE; 
  } 

  function smtp_sockopen($address) {
    if ($this->relay_host == "") {
      return $this->smtp_sockopen_mx($address); 
    } else {
      return $this->smtp_sockopen_relay(); 
    } 
  } 

  function smtp_sockopen_relay() {
    $this->log_write("Trying to ".$this->relay_host.":".$this->smtp_port."\n"); 
    $this->sock = @fsockopen($this->relay_host, $this->smtp_port, $errno, $errstr, $this->time_out); 
    if (!($this->sock && $this->smtp_ok())) {
      $this->log_write("Error: Cannot connenct to relay host ".$this->relay_host."\n"); 
      $this->log_write("Error: ".$errstr." (".$errno.")\n"); 
      return FALSE; 
    } 
    $this->log_write("Connected to relay host ".$this->relay_host."\n"); 
    return TRUE;
  } 

  function smtp_sockopen_mx($address) {
    $domain = preg_replace("/^.+@([^@]+)$/", "\1", $address); 
    if (!@getmxrr($domain, $MXHOSTS)) {
      $this->log_write("Error: Cannot resolve MX \"".$domain."\"\n"); 
      return FALSE; 
    } 
    foreach ($MXHOSTS as $host) {
      $this->log_write("Trying to ".$host.":".$this->smtp_port."\n"); 
      $this->sock = @fsockopen($host, $this->smtp_port, $errno, $errstr, $this->time_out); 
      if (!($this->sock && $this->smtp_ok())) {
        $this->log_write("Warning: Cannot connect to mx host ".$host."\n"); 
        $this->log_write("Error: ".$errstr." (".$errno.")\n"); 
        continue; 
      } 
      $this->log_write("Connected to mx host ".$host."\n"); 
      return TRUE; 
    } 
    $this->log_write("Error: Cannot connect to any mx hosts (".implode(", ", $MXHOSTS).")\n"); 
    return FALSE; 
  } 

  function smtp_message($header, $body) {
    fputs($this->sock, $header."\r\n".$body); 
    $this->smtp_debug("> ".str_replace("\r\n", "\n"."> ", $header."\n> ".$body."\n> ")); 
    return TRUE; 
  } 

  function smtp_eom() {
    fputs($this->sock, "\r\n.\r\n"); 
    $this->smtp_debug(". [EOM]\n"); 
    return $this->smtp_ok(); 
  } 

  function smtp_ok() {
    $response = str_replace("\r\n", "", fgets($this->sock, 512)); 
    $this->smtp_debug($response."\n"); 
    if (!preg_match("/^[23]/", $response)) {
      fputs($this->sock, "QUIT\r\n"); 
      fgets($this->sock, 512); 
      $this->log_write("Error: Remote host returned \"".$response."\"\n"); 
      return FALSE; 
    } 
    return TRUE; 
  } 

  function smtp_putcmd($cmd, $arg = "") {
    if ($arg != "") {
      if($cmd=="") {
        $cmd = $arg; 
      } 
      else 
      { 
        $cmd = $cmd." ".$arg; 
      } 
    } 
    fputs($this->sock, $cmd."\r\n"); 
    $this->smtp_debug("> ".$cmd."\n"); 
    return $this->smtp_ok(); 
  } 

  function smtp_error($string) {
    $this->log_write("Error: Error occurred while ".$string.".\n"); 
    return FALSE; 
  } 

  function log_write($message) {
    $this->smtp_debug($message); 
    if ($this->log_file == "") {
      return TRUE; 
    } 
    $message = date("M d H:i:s ").get_current_user()."[".getmypid()."]: ".$message; 
    if (!@file_exists($this->log_file) || !($fp = @fopen($this->log_file, "a"))) {
      $this->smtp_debug("Warning: Cannot open log file \"".$this->log_file."\"\n"); 
      return FALSE;
    } 
    flock($fp, LOCK_EX); 
    fputs($fp, $message); 
    fclose($fp); 
    return TRUE; 
  } 

  function strip_comment($address) {
    $comment = "/\([^()]*\)/"; 
    while (preg_match($comment, $address)) {
      $address = preg_replace($comment, "", $address); 
    } 
    return $address; 
  } 

  function get_address($address) {
    $address = preg_replace("/([ \t\r\n])+/", "", $address); 
    return preg_replace("/^.*<(.+)>.*$/", "\1", $address); 
  } 

  function smtp_debug($message) {
    if ($this->debug) {
      echo $message; 
    } 
  } 
} 
?>